Dr. Muthen, I am confused about interpretations for ib sb on w, and c on w in example 10.9 in Mplus user's guide in 2007. Would you please explain them for me? Thank you I appreciate all your help! Hao Duong

I have two questions. I am attempting to establish a GMM with four time points. However, the time points are not equally spaced. I do have an indicator of time (age at each assessment).

1. Would this preclude me from using a traditional GMM? I was under the impression that I would have to use a two level model, rather than LGCM because of the unequal time between interviews, and regress my outcome on my time variable.

2. Also, if multilevel modeling is required, would it still be possible to examine classes of trajectories?

I should clarify as this is unclear. I have been able to run these models using the TYPE = RANDOM command for the individually varying time scores. I am wondering if there is a way, using this option, to examine classes of trajectories? If so, how would I specify this model in MPlus?

I'm doing multilevel latent class analysis with 12 items which have 4 categorical options. I tried few times but keep pop up some error message. And I'm not sure what's gone wrong. Hope someone can advise me on this. many thanks.

It sounds like you are reading your data incorrectly. Perhaps the number of variable names is not the same as the number of columns in your data set or you have blanks in your data. If you can't figure this out, send your files and license number to support@statmodel.com.

I would like to code the mixtures nominal, yielding discrete random effects. For identification I use effect-coding for the mixtures. But when using the following syntax, there are no differences for the latent means across mixtures; both are zero.

Hello, I'm running Multilevel Latent Class model similar to model presented in Henry&Muthén(2010). The core of the model is multilevel logistic model: resp on negd1 negd2 negd3; and 2 latent classes are specified. Estimation of the model works when I've two regression in each of the latent class:

But the problem appears when I want to have empty logistic model in class 2. i.e model without explanatory variables. I was trying several specifications. None of them worked. While I'm declaring ON statement in %OVERALL% part I get ON statements in all classes. When ON statement is not declared in %OVERALL% part I'm not allowed to specify it for class 1. Is there a way to specify logistic model with explanatory variables in class 1 and empty model in class 2?

Hello, I plan to use UG Example 10.12 (two-level LTA with a covariate) for my analyses. I have students nested in schools. I understand the code in the example, except I want to clarify one aspect of it.

In the code below, why are the indicators for the latent classes modeled at the between level? If these reflect individual responses (such as from individual students), wouldn't those be on the within level?

Or is it that because we are estimating probabilities (or mean responses) for the items for persons, conditional on class, this becomes an average across persons--no longer on the within level? Thank you.

OK, may I request your input on the following questions regarding this section of the code: %BETWEEN% %OVERALL% c1#1 ON w; c2#1 ON c1#1 w; c1#1 c2#1;

Understanding the code above: 1) Why is c2#2 ON c1#2 (and other combinations such as c2#2 ON c1#1) not above, similar to the second line? I believe that the code above regresses the cluster-level (average or intercept) latent status for class 1 of c2 on that for class 1 of c1. This is part of the random intercept setup. But wouldn't regressing the second class of each latent class variable make sense to do as well?

2) By the same token, why does the above code not show "c1#2 c2#2;" as well? Is it that by allowing intercepts for the first class for each latent class variable to vary across clusters, these are already free to differ from those for the second latent classes?

Altering the code for my data: 3) If I have 3 latent class variables rather than 2, and want to have random intercepts, I would also model c3#1 ON c2#1, right?

4) Finally, if I try a model without random intercepts, would I remove both the "c2#1 ON c1#1", and "c1#1 c2#1;" sections of code?

Dear Muthen I am writing this post to ask MLCA analysis. is it possible to run "multilevel LCA" with covariates and distal outcome simultaneously? the number of individual cases are 580 nested with 30 organizations.

I'm now considering to calculate the MOR proposed by Larsen & Merlo (2005). But due to my poor statistical ability, I cannot understand the mathematical expression shown in page 83, 1st line. Could anyone give me some example with actual number to calculate MOR in this article?